diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2019-07-10 23:43:13 -0700 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2019-08-15 13:42:28 +0800 |
| commit | 4d2583dba13f9313f21fb58fb3a4c51b11770e44 (patch) | |
| tree | 26cf69a122a61b2a54ff75b6489414353cff1348 /arch/riscv/cpu/start.S | |
| parent | 268753f8e6e7e201966763c53acfea84941ed544 (diff) | |
riscv: Access CSRs using CSR numbers
We should prefer accessing CSRs using their CSR numbers
because:
1. It compiles fine with older toolchains.
2. We can use latest CSR names in #define macro names of CSR
numbers as-per RISC-V spec.
3. We can access newly added CSRs even if toolchain does not
recognize newly added CSRs by name.
This commit is inspired from Linux kernel commit a3182c91ef4e
("RISC-V: Access CSRs using CSR numbers").
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Diffstat (limited to 'arch/riscv/cpu/start.S')
| -rw-r--r-- | arch/riscv/cpu/start.S | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index 60ac8c621e..e06db404f5 100644 --- a/arch/riscv/cpu/start.S +++ b/arch/riscv/cpu/start.S @@ -13,7 +13,6 @@ #include <config.h> #include <common.h> #include <elf.h> -#include <asm/csr.h> #include <asm/encoding.h> #include <generated/asm-offsets.h> @@ -41,7 +40,7 @@ secondary_harts_relocation_error: .globl _start _start: #ifdef CONFIG_RISCV_MMODE - csrr a0, mhartid + csrr a0, CSR_MHARTID #endif /* save hart id and dtb pointer */ |